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<p>Electron-boson coupling is central to a comprehensive understanding of the diverse physical phenomena emerging from many-body interactions. Yet less attention has been paid to how plasmons, collective bosonic modes of electron density oscillation, interact with conduction electrons and how external parameters can tune this interaction. Here, we present a clear display of composite quasiparticles stemming from electron-plasmon coupling, known as the plasmonic polaron, in self-intercalated 1<i>T</i>-TiS<sub>2</sub>, by using angle-resolved photoemission spectroscopy (ARPES), high-resolution electron energy loss spectroscopy (HR-EELS) and first-principles calculations. The single particle spectral function exhibits a distinctive plasmon-loss satellite with the same characteristic energy scale determined by HR-EELS measurements. The bosonic energy scale of plasmonic polaron is tunable by controlling charge carrier density and temperature, distinguishing itself from conventional polarons arising from electron-phonon interactions. Furthermore, we find that the dielectric screening strongly affects the formation of the plasmonic polaron states. Our findings provide direct spectroscopic evidence of plasmonic polarons and establish self-intercalated layered materials as a promising platform for studying, controlling, and harnessing plasmonic interactions in quantum materials.</p>

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Plasmonic polaron in self-intercalated 1T-TiS2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月28日

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  • Byoung Ki Choi,
  • Woojin Choi,
  • Zhiyu Tao,
  • Ji-Eun Lee,
  • Sae Hee Ryu,
  • Seungrok Mun,
  • Hyobeom Lee,
  • Kyoungree Park,
  • Seha Lee,
  • Hayoon Im,
  • Yong Zhong,
  • Hyejin Ryu,
  • Min Jae Kim,
  • Sue Hyeon Hwang,
  • Xuetao Zhu,
  • Jiandong Guo,
  • Jong Mok Ok,
  • Jaekwang Lee,
  • Haeyong Kang,
  • Sungkyun Park,
  • Jonathan D. Denlinger,
  • Heung-Sik Kim,
  • Aaron Bostwick,
  • Zhi-Xun Shen,
  • Choongyu Hwang,
  • Sung-Kwan Mo,
  • Jinwoong Hwang

摘要

Electron-boson coupling is central to a comprehensive understanding of the diverse physical phenomena emerging from many-body interactions. Yet less attention has been paid to how plasmons, collective bosonic modes of electron density oscillation, interact with conduction electrons and how external parameters can tune this interaction. Here, we present a clear display of composite quasiparticles stemming from electron-plasmon coupling, known as the plasmonic polaron, in self-intercalated 1T-TiS2, by using angle-resolved photoemission spectroscopy (ARPES), high-resolution electron energy loss spectroscopy (HR-EELS) and first-principles calculations. The single particle spectral function exhibits a distinctive plasmon-loss satellite with the same characteristic energy scale determined by HR-EELS measurements. The bosonic energy scale of plasmonic polaron is tunable by controlling charge carrier density and temperature, distinguishing itself from conventional polarons arising from electron-phonon interactions. Furthermore, we find that the dielectric screening strongly affects the formation of the plasmonic polaron states. Our findings provide direct spectroscopic evidence of plasmonic polarons and establish self-intercalated layered materials as a promising platform for studying, controlling, and harnessing plasmonic interactions in quantum materials.